| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Subjects with R/R NHL, which includes diffuse large B-cell lymphoma (DLBCL) (not otherwise specified [NOS] or transformed), FL (follicular lymphoma), mantle cell lymphoma (MCL), relapsed or refractory marginal zone lymphoma (R/R MZL) or primary central nervous system lymphoma (PCNSL) who have failed at least 2 lines of therapy (or who have received at least one prior line of standard therapy and are not eligible for any other therapy). | 
 
 
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| E.1.1.1 | Medical condition in easily understood language  | 
| Patients who have stopped responding or have failed to respond to treatment for cancer of a type of white blood cell. | 
 
 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Cancer [C04] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 24.0 | 
 
| E.1.2 | Level  | LLT | 
 
| E.1.2 | Classification code  | 10067070 | 
 
| E.1.2 | Term  | Follicular B-cell non-Hodgkin's lymphoma | 
 
| E.1.2 | System Organ Class  | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) | 
 
 
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| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 20.0 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10061275 | 
 
| E.1.2 | Term  | Mantle cell lymphoma | 
 
| E.1.2 | System Organ Class  | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) | 
 
 
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| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 21.0 | 
 
| E.1.2 | Level  | LLT | 
 
| E.1.2 | Classification code  | 10036685 | 
 
| E.1.2 | Term  | Primary central nervous system lymphoma | 
 
| E.1.2 | System Organ Class  | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) | 
 
 
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| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 21.0 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10012818 | 
 
| E.1.2 | Term  | Diffuse large B-cell lymphoma | 
 
| E.1.2 | System Organ Class  | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) | 
 
 
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| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 20.0 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10076596 | 
 
| E.1.2 | Term  | Marginal zone lymphoma | 
 
| E.1.2 | System Organ Class  | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) | 
 
 
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| E.1.3 | Condition being studied is a rare disease  |  Yes  | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial  | 
- To determine the safety and tolerability of CC-99282 alone and in combination with rituximab, obinutuzumab, tafasitamab, or valemetostat ± rituximab in subjects with R/R NHL - To define the maximum tolerated dose (MTD) and/or the recommended Phase 2 doses (RP2D) of CC-99282 as monotherapy or in combination with anti-lymphoma agents in subjects with R/R NHL | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
- To characterize the pharmacokinetics (PK) of CC-99282 in plasma when administered alone or in combination with anti-lymphoma agents - To provide information on the preliminary efficacy of CC-99282 alone or in combination with rituximab, obinutuzumab, tafasitamab or valemetostat ± rituximab in R/R NHL | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
1. Subject is ≥18 years of age at the time of signing the informed consent form (ICF). 2. Subject has a history of NHL (including DLBCL, FL, MZL, MCL, and PCNSL) with relapsed or refractory disease 3. Subject has an Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1 or 2. 4. Subjects must have the following laboratory values: a. Absolute neutrophil count (ANC) ≥ 1.5 x 109/L without growth factor support for 7 days (14 days if pegfilgastrim) b. Hemoglobin (Hgb) ≥ 8 g/dL c. Platelets (plt) ≥ 75 x 109/L without transfusion for 7 days d. Serum bilirubin ≤ 1.5 x ULN (upper limit of normal). e. AST/SGOT and ALT/SGPT ≤ 2.5X ULN f. Estimated serum creatinine clearance of ≥ 45 mL/min using the Cockcroft-Gault equation. 5. Agree to follow the CC-99282 Pregnancy Prevention Plan (PPP) | 
 
 
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| E.4 | Principal exclusion criteria | 
1. Subject has life expectancy ≤ 2 months. 2. Subjects who have aggressive lymphoma relapse requiring immediate cytoreductive therapy to avoid potential life-threatening consequences (eg, due to tumor location). 3. Subject has received prior systemic anti-cancer treatment (approved or investigational) ≤ 5 half-lives or 4 weeks prior to starting investigational product(s), whichever is shorter. 4. Subject has symptomatic CNS involvement of disease (does not apply to PCNSL subjects in Part B). 5. Subject is on chronic systemic immunosuppressive therapy or corticosteroids (eg, prednisone or equivalent not to exceed 10 mg per day within the last 14 days) or subjects with clinically significant graft versus- host disease (GVHD). 6. Subject had prior autologous SCT ≤ 3 months prior to starting investigational product(s) and any treatment-related toxicity is unresolved (grade > 1). 7. Subject had prior allogeneic SCT with either standard or reduced intensity conditioning ≤ 6 months prior to starting investigational product(s) and any treatment-related toxicity is unresolved (grade > 1). | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
Safety: AEs including treatment-emergent adverse events (TEAEs), laboratory assessments, vital signs, ECG results, ECOG performance status, LVEF assessments, and physical examinations. 
 Recommended Phase 2 Dose (RP2D) and dosing Schedule(s): Dose limiting toxicities (DLTs), and Maximum Tolerated Dose (MTD) during the DLT evaluation period; establish the RP2D and optimal schedule of CC-99282 as monotherapy and in combination with rituximab obinutuzumab, tafasitamab or valemetostat ± rituximab. | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
Safety: From first subject first visit until 28 days after the last subject discontinues study treatment 
 Recommended Phase 2 Dose and dosing Schedule(s): Dose escalation and expansion | 
 
 
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| E.5.2 | Secondary end point(s) | 
Pharmacokinetics (PK) parameters 
 Preliminary efficacy: Determined by the Lugano Classification for NHL response criteria including: - Objective response rate (ORR), any complete response (CR) or partial response (PR) as best response - Time to response (TTR) - Duration of response (DoR) - Progression free survival (PFS) and overall survival (OS) - And additional DOR, PFS and OS for subjects treated for 6 cycles with CC-99282 + rituximab who discontinue due to achieving CR (Cohort I). 
 Preliminary efficacy in PCNSL: Determined using the modified International PCNSL Collaborative Group (IPCG) criteria including: - Objective response rate (ORR) - Time to response (TTR) - Duration of response (DoR) - Progression free survival (PFS) and overall survival (OS) | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
PK parameters: Dose escalation and expansion Preliminary efficacy: Dose escalation and expansion Preliminary efficacy in PCNSL: Dose Expansion | 
 
 
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| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  No  | 
| E.6.2 | Prophylaxis |  No  | 
| E.6.3 | Therapy |  No  | 
| E.6.4 | Safety |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  Yes  | 
| E.6.7 | Pharmacodynamic |  Yes  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  Yes  | 
| E.6.10 | Pharmacogenetic |  No  | 
| E.6.11 | Pharmacogenomic |  Yes  | 
| E.6.12 | Pharmacoeconomic |  No  | 
| E.6.13 | Others |  No  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  Yes  | 
| E.7.1.1 | First administration to humans |  No  | 
| E.7.1.2 | Bioequivalence study |  No  | 
| E.7.1.3 | Other |  Yes  | 
| E.7.1.3.1 | Other trial type description | 
| Safety and tolerability of CC-99282  | 
 
 
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| E.7.2 | Therapeutic exploratory (Phase II) |  Yes  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  No  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  No  | 
| E.8.1.1 | Randomised |  No  | 
| E.8.1.2 | Open |  Yes  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  No  | 
| E.8.1.5 | Parallel group |  No  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  No  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  No  | 
| E.8.2.2 | Placebo  |  No  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 5 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 2 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 30 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA |  Yes  | 
| E.8.6.2 | Trial being conducted completely outside of the EEA |  No  | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Argentina | 
 
| Chile | 
 
| Brazil | 
 
| Canada | 
 
| Israel | 
 
| United Kingdom | 
 
| United States | 
 
| Austria | 
 
| Belgium | 
 
| Denmark | 
 
| France | 
 
| Germany | 
 
| Italy | 
 
| Spain | 
 
 
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| E.8.7 | Trial has a data monitoring committee |  No  | 
| E.8.8 | 
                        Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial
                     | 
The End of Trial is defined as either the date of the last visit of the last subject to complete the post-treatment follow-up, or the date of receipt of the last data point from the last subject that is required for primary, secondary and/or exploratory analysis, as pre-specified in the protocol, whichever is the later date. 
 The study will close at a maximum of 2 years and 6 months after the last subject is enrolled. | 
 
 
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| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 3 | 
| E.8.9.1 | In the Member State concerned months | 5 | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial years | 9 |